Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Should I do an upgrade or a completly new install with a new profile

  • 1 reply
  • 1 has this problem
  • 8 views
  • Paskiausią atsakymą parašė cor-el

more options

I last used Firefox regularly over a year ago when the upgrade to version 4 caused excessive memory use and FF to regularly freeze.

Given the problems I experienced at the time & the multiple versions since then:

1. would it be preferable to do a separate installation of the new version with a new profile

2. how do I do this and keep my old version so that I can use it as a reference for bookmarks, plugins, etc.

I last used Firefox regularly over a year ago when the upgrade to version 4 caused excessive memory use and FF to regularly freeze. Given the problems I experienced at the time & the multiple versions since then: 1. would it be preferable to do a separate installation of the new version with a new profile 2. how do I do this and keep my old version so that I can use it as a reference for bookmarks, plugins, etc.

Modified by IslanderCirce

All Replies (1)

more options

You can install multiple Firefox versions via a custom install in different installation folders and use a separate profile folder for each version.


Do a custom install and install each version in its own program folder to use multiple Firefox versions.

Make sure not to start Firefox after the installation has finished.
Create a new profile exclusively for each Firefox version.
Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.

See these mozillaZine KB articles for information:


You can find the latest Firefox release in all languages and for all Operating Systems here: